diff --git a/docs/apps/duffy/index.md b/docs/apps/duffy/index.md
new file mode 100644
index 0000000..d5cd941
--- /dev/null
+++ b/docs/apps/duffy/index.md
@@ -0,0 +1 @@
+Duffy is the middle layer running ci.centos.org that manages the provisioning, maintenance and teardown / rebuild of the Nodes (physical hardware for now, VMs coming soon) that are used to run the tests in the CI Cluster.
diff --git a/mkdocs.yml b/mkdocs.yml
index 309b9e8..ed6d420 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -47,7 +47,7 @@ nav:
          - Onboarding sysadmins: operations/ci/onboarding_sysadmin.md
          - Outage Preparation: operations/ci/outage_preparation.md
          - Replacing Certs: operations/ci/replacing_certs.md
-         - Upgrades: 
+         - Upgrades:
            - operations/ci/upgrades/upgrade-notification-template.md
            - operations/ci/upgrades/upgrade-jenkins.md
 
@@ -73,6 +73,8 @@ nav:
       - Mirrors CDN:
         - buildsys/mirror-network.md
   - Public Applications:
+      - Duffy:
+        - About: apps/duffy/index.md
       - apps/www.md
       - apps/wiki.md
       - apps/bugs.md